sync: sync stddef.h UAPI header

It contains __struct_group() macro needed for pkt_cls.h UAPI header...

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

include/uapi/linux/stddef.h

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_STDDEF_H
+#define _LINUX_STDDEF_H
+
+
+
+#ifndef __always_inline
+#define __always_inline inline
+#endif
+
+/* Not all C++ standards support type declarations inside an anonymous union */
+#ifndef __cplusplus
+#define __struct_group_tag(TAG)		TAG
+#else
+#define __struct_group_tag(TAG)
+#endif
+
+/**
+ * __struct_group() - Create a mirrored named and anonyomous struct
+ *
+ * @TAG: The tag name for the named sub-struct (usually empty)
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @ATTRS: Any struct attributes (usually empty)
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical layout
+ * and size: one anonymous and one named. The former's members can be used
+ * normally without sub-struct naming, and the latter can be used to
+ * reason about the start, end, and size of the group of struct members.
+ * The named struct can also be explicitly tagged for layer reuse (C only),
+ * as well as both having struct attributes appended.
+ */
+#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
+	union { \
+		struct { MEMBERS } ATTRS; \
+		struct __struct_group_tag(TAG) { MEMBERS } ATTRS NAME; \
+	} ATTRS
+
+#ifdef __cplusplus
+/* sizeof(struct{}) is 1 in C++, not 0, can't use C version of the macro. */
+#define __DECLARE_FLEX_ARRAY(T, member)	\
+	T member[0]
+#else
+/**
+ * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
+ *
+ * @TYPE: The type of each flexible array element
+ * @NAME: The name of the flexible array member
+ *
+ * In order to have a flexible array member in a union or alone in a
+ * struct, it needs to be wrapped in an anonymous struct with at least 1
+ * named member, but that member can be empty.
+ */
+#define __DECLARE_FLEX_ARRAY(TYPE, NAME)	\
+	struct { \
+		struct { } __empty_ ## NAME; \
+		TYPE NAME[]; \
+	}
+#endif
+
+#ifndef __counted_by
+#define __counted_by(m)
+#endif
+
+#ifndef __counted_by_le
+#define __counted_by_le(m)
+#endif
+
+#ifndef __counted_by_be
+#define __counted_by_be(m)
+#endif
+
+#ifdef __KERNEL__
+#define __kernel_nonstring	__nonstring
+#else
+#define __kernel_nonstring
+#endif
+
+#endif /* _LINUX_STDDEF_H */

scripts/sync-kernel.sh

@@ -40,17 +40,18 @@ declare -A PATH_MAP
 PATH_MAP=(									\
 	[tools/lib/bpf]=src							\
 	[include/uapi/linux/bpf_common.h]=include/uapi/linux/bpf_common.h	\
-	[include/uapi/linux/bpf.h]=include/uapi/linux/bpf.h		\
-	[include/uapi/linux/btf.h]=include/uapi/linux/btf.h		\
-	[include/uapi/linux/fcntl.h]=include/uapi/linux/fcntl.h		\
-	[include/uapi/linux/openat2.h]=include/uapi/linux/openat2.h	\
-	[include/uapi/linux/if_link.h]=include/uapi/linux/if_link.h	\
+	[include/uapi/linux/bpf.h]=include/uapi/linux/bpf.h			\
+	[include/uapi/linux/btf.h]=include/uapi/linux/btf.h			\
+	[include/uapi/linux/fcntl.h]=include/uapi/linux/fcntl.h			\
+	[include/uapi/linux/openat2.h]=include/uapi/linux/openat2.h		\
+	[include/uapi/linux/if_link.h]=include/uapi/linux/if_link.h		\
 	[include/uapi/linux/if_xdp.h]=include/uapi/linux/if_xdp.h		\
 	[include/uapi/linux/netdev.h]=include/uapi/linux/netdev.h		\
-	[include/uapi/linux/netlink.h]=include/uapi/linux/netlink.h	\
-	[include/uapi/linux/pkt_cls.h]=include/uapi/linux/pkt_cls.h	\
-	[include/uapi/linux/pkt_sched.h]=include/uapi/linux/pkt_sched.h	\
+	[include/uapi/linux/netlink.h]=include/uapi/linux/netlink.h		\
+	[include/uapi/linux/pkt_cls.h]=include/uapi/linux/pkt_cls.h		\
+	[include/uapi/linux/pkt_sched.h]=include/uapi/linux/pkt_sched.h		\
 	[include/uapi/linux/perf_event.h]=include/uapi/linux/perf_event.h	\
+	[include/uapi/linux/stddef.h]=include/uapi/linux/stddef.h		\
 	[Documentation/bpf/libbpf]=docs						\
 )
 
@@ -63,7 +64,7 @@ LIBBPF_TREE_FILTER="mkdir -p __libbpf/include/uapi/linux __libbpf/include/tools
 for p in "${!PATH_MAP[@]}"; do
 	LIBBPF_TREE_FILTER+="git mv -kf ${p} __libbpf/${PATH_MAP[${p}]} && "$'\\\n'
 done
-LIBBPF_TREE_FILTER+="find __libbpf/include/uapi/linux -type f -exec sed -i 's/_UAPI\(__\?LINUX\)/\1/' {} + && "$'\\\n'
+LIBBPF_TREE_FILTER+="find __libbpf/include/uapi/linux -type f -exec sed -i -e 's/_UAPI\(__\?LINUX\)/\1/g' -e 's@^#include <linux/compiler_types.h>@@' + && "$'\\\n'
 LIBBPF_TREE_FILTER+="git rm --ignore-unmatch -f __libbpf/src/{Makefile,Build,test_libbpf.c,.gitignore} >/dev/null"
 
 cd_to()